I assume, that you want to use the LAS.
For each device, that is connected to the ActionPad at the same point of time, you will need 1 automation credit.
In the application settings you can specify, how many devices are allowed to access the ActionPad at the same time.
All devices, that are connected to a page, see the same. So when I move a fader you can see this movement on the other connected devices, too.
You can use 12 different groups in oder to offer 12 different views. For each group you will need at least one page.
You can address the groups like this in the browser:
Or set it accordingly in the ActonPad app.
Here it is necessary to set this in every tablet to a different group.
Switch off Menu, Tabs and Taskbar.
Add Buttons for Navigation to other pages.
Add a Page without Group to the very fist position.
This is no real user management and no secured access. But under normal circumstances this should do what you require.
I hope this helps.
Kind regards / Freundliche Grüße